feat: add padding option for inactive workspace numbers

[keonly]

Hi, I added an extra option to enable setting the paddings for inactive numbered workspaces.

• Before
  
  
  (Notice the inconsistency of the workspace number positions!)
• After (theme.bar.buttons.workspaces.numbered_inactive_padding = "0.4em";)
  
  

In both cases, I have set theme.bar.buttons.workspaces.numbered_active_highlight_padding to 0.4em. Please let me know what you think. Thanks for the great project!

[Jas-SinghFSU]

Is this different than the current Spacing option under Configuration > Bar > Workspaces > Spacing?

[keonly]

I found that the positions of the workspace buttons were still inconsistent when only bar.workspaces.spacing was adjusted.

Here is an example of such inconsistency when bar.workspaces.spacing is set to 2 and theme.bar.buttons.workspaces.numbered_active_highlight_padding is set to 0.4em.

[keonly]

Here are better visualisations of the change made in this PR!

• Before (adjusted with spacing only)

before.mp4

• After

after.mp4

[Jas-SinghFSU]

Nice, in that case we should probably remove the spacing option since this is more robust.
Scratch that since this only effects inactive workspaces.

[Jas-SinghFSU]

Can we move the Inactive Padding setting right below the Highlight Padding so it's logically grouped?

[keonly]

Updated! Would this be good?

[Jas-SinghFSU]

Yep, thanks for the contribution ❤️